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#ifndef PNGTILE_CACHE_H
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#define PNGTILE_CACHE_H
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/**
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* @file
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*
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* Internal image cache implementation
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*/
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#include "image.h"
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/**
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* State for cache access
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*/
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struct pt_cache {
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};
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/**
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* On-disk header
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*/
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struct pt_cache_header {
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/** Pixel dimensions of image */
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uint32_t width, height;
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/** Pixel format */
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uint8_t bit_depth, color_type;
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/** Convenience field for number of bytes per row */
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uint32_t row_bytes;
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};
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/**
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* Construct the image cache info object associated with the given image.
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*/
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int pt_cache_open (struct pt_cache **cache_ptr, struct pt_image *img, int mode);
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/**
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* Verify if the cached data is still fresh compared to the original.
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*/
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bool pt_cache_fresh (struct pt_cache *cache);
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/**
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* Update the cache data from the given PNG image.
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*/
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int pt_cache_update_png (struct pt_cache *cache, png_structp png, png_infop info);
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#endif
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